The TPHD Aluminized Steel 12 Inch X 12 Inch 45 Degree Exhaust Elbow is a reliable replacement for the Dynaflex Number 12L-500. With a 5-inch inside diameter and 5-inch outside diameter, it offers a perfect fit for your exhaust system. The centerline measures 5-1/2 inches, ensuring optimal performance. Crafted from durable aluminized steel, this exhaust elbow guarantees long-lasting durability. Its 45-degree angle allows for efficient exhaust flow, reducing backpressure and enhancing engine performance. Upgrade your exhaust system with this practical and high-quality product.